Rider and the PI Pack solve a snow monster mystery in this ninth Rider Woofson adventure. Even the greatest dog detective in the world deserves a little time away from fighting crime, so Rider and the PI Pack head to the Mystery Mountain ski resort for a well-deserved vacation. But when they arrive the entire ski lodge is deserted! Turns out there's a Snowbot on the loose, scaring all the visitors away. Now it's up to Rider and the team to get to the bottom of this winter caper, even on their day off. Will the PI Pack be able to uncover the secret behind Mystery Mountain? With easy-to-read language and illustrations on almost every page, the Rider Woofson chapter books are perfect for emerging readers.